Tool holder for planers



Jan. 25, 1927. 1,615,787

F. E. CARDULLO TOOL HOLDER FOR PLANERS Filed Aug. 18, 1 23 ATTO/P/IQF/S.

Patented Jan. 25, 1927.

UNITED STATES PATEN!" OFFICE.

ronnnsr n. CARDULLO, or CINCINNATI, orrro, assrGNon' 'ro THE G. A. GRAY Conn.

PANY, F CINCINNATI, OHIO, A CORPORATION OF OHIOi TOOL HOLDER FOR PLANERS.

Application filed August 18, 1923.

In planers and other machine tools where either the work or the tools reciprocate, it is customary to employ a swinging block as a support for the tool, in order that the tool may swing out of the way on the return stroke of the machine, thus avoiding damage to the edge of the tool. This swinging block is commonly known as the clapper block or tool apron and is pivoted in a part commonly known as the clapper box or tool box, swinging between the sides of the box. During the cutting stroke the upward thrust due to the tool pressure acts against the pivot pin, which throws a great strain upon this pin. This tends to shear and to permanently distort the pin, thus destroying the truth of the pivot on which the tool apron swings. The purpose of my invention is to provide a method for relieving this pin of a part or all of this strain.

Vhen the tool is clamped against the tool apron the strain of clamping tends to distort the apron. For this reason it is desirable to make the apron as stiff as possible, and it is the further purpose of my invention to give the apron additional stiffness, to the end that the tendency to spring out of shape is minimized.

In the drawings:

Figure 1 is a front view of the tool box and apron.

Figure 2 is a side view. 7

Figure 3 is a section through the tool box and apron on line 3-3 in Figure 1.

Figure & is a section through the tool box and apron on line 44in Figure 1, with the tool and clamps removed.

In these drawings 1 is a tool box having wing-like extensions 1 and 1 2 is the tool apron which is machined to fit closely between these wing-like extensions, so as to be incapable of lateral movement. 3 is a taper pin fitting closely in a taper hole reamed through the wings of the tool box, and the upper portion of the tool apron. The apron is free to swing on this pin. 4 is a nut to prevent the taper pin from coming out of the hole. 5, 5, 5, and 5, are four bolts for fastening the tool to the apron. 6 and 6 are clamps for the tool, while 7, 7, 7 and 7, are nuts for the bolts. 8 is the tool, which is clamped to the apron in the usual manner.

On the back of the apron 2 along the lower edge is a projection or tongue 2 two surfaces of which are machined to abut Serial N0. 658,082.

against complementary surfaces 1 and 1 machined in the tool box, when the apron is in the position shown in full. lines (i. e. the position of the apron during the cutting stroke). This projection does not interfere when the apron swings forward into the position shown by the dotted lines, on the return stroke of the machine.

During the cutting stroke the work exerts upon the tool a pressure having the general direction shown by the arrow. The horizontal component of this pressure is exerted by the projection on the apron against the vertical machined surface 1 on the tool box. lVith the usual form of tool apron, not having the projection 2*, the vertical component of this pressure would 'be exerted against the taper pin. However, by providing the projection 2, the vertical component of the tool pressure is transmitted by the projection to the horizontal machined surface 1 of the box. This relieves the pin of a great deal of pressure which would otherwise come upon it.

It will be noted that the stresses in the clamping bolts 5, 5, 5, and tend to bend the apron around the tool. The thicker the apron, theless the tendency is to bend. The tongue which I provide alongthe lower edge of the back of the apron increases its thickness at that point and thereby assists in giving the apron rigidity. In fact, when the tongue is made to extend clear across the apron, as is preferred, the springing of the apron in any direction is substantially eliminated.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is:-

1. In a machine of the type specified, a cutting tool, means for clamping the cutting tool to the front surface of a tool apron, a tool apron pivoted near one end and hav ing means formed along a horizontal edge of the rear surface of the said apron, for transmitting the axial component of the tool pressure, and a tool box having means formed thereon adapted to co-act with said first means to receive the said axial component of the tool pressure, the said tool box having machined projections on either side of the apron adapted to restrain the apron laterally.

2. in a machine of the type specified, a cutting tool, means for clamping the cutting tool to the front surface of a tool apron, a tool apron pivoted near one end and having a machined surface formed along a horizontal edge of the rear part of the said apron, adapted to transmit the axial component of the tool pressure, and a tool box having a machined surface adapted to co-act with said first mentioned machined surface to receive the said axial component ofthe tool pressure, the said tool box having machined projections on either side of the apron adapted to restrain the apron laterally.

3. In a machine of the type specified, a cutting tool, means for clamping the cutting tool to the front surface of a tool apron, a tool apron pivoted near one end and having a tongue formed along the rear edge of the other end thereof for the purpose of transmitting the axial component of the tool pressure, a pivot pin, and a tool box having a groove formed along the lower end thereof adapted to co-act with the said tongue for the purpose of receiving the axial component of the tool pressure, the said tool box being provided with machined projections on either sideofthe apron adapted to restrain the apron laterally.

4. In a machine of the type specified, a cutting tool, means for clamping the cutting tool to the front surface of a tool apron, a tool apron pivoted near one end and hav ing a tongue formed along the rear edge of the other end thereof, adapted to transmit the axial and horizontal components of the tool pressure, a pivot pin, and a tool box having a groove formed along the lower end thereof adapted to co-act with the said tongue for the purpose of receiving the axial and horizontal components of the tool pressure, the said tool box being provided with machined projections on either side of the apron adapted to receive the lateral component of the tool pressure.

5. In a machine of the type specified, a

cutting tool, means adapted to clamp the cutting tool to the front surface of an apron, an apron pivoted at its upper end and having a projection extending across the lower end of the rear surface thereof, and a tool box formed with a groove into which the said projection will swing, the said groove providing a seat for the said projection in order to resist the axial component of the tool pressure, the said tool box being provided with machined projections on either side of the apron adapted to restrain the apron laterally.

6. In a machine of the type specified, a cutting tool, means adapted to clamp the said tool to the front surface of an apron, an apron pivoted at its upper end to a tool box, the said apron having a ton 'ue or projection extending across the lower end of the rear surface thereof, a d a tool box having a groove into which the said projection will swing, the said groove providing a seat for the said projection adapted to resist the axial and horizontal components of the tool pressure, the said tool box having machined projections on either side of the said apron adapted to resist the lateral component of the tool pressure.

7. In a machine of the type specified, a cutting tool, means for clamping the cutting tool to a swinging block, a swinging block pivoted near one end and having a tongue formed along the rear edge of the other one thereof, the said tongue being adapted to stiffen the block against the clamping forces, a pivot pin, and a tool box having a groove formed therein adapted to co-act with the said tongue for the purpose of relieving the pivot pin of the axial component of the tool pressure, the said tool box having machined projections on either side of the swinging block adapted to relieve the pivot pin of the lateral con'iponent of the tool pressure.

FORREST E, CARDULLO; 

